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Michael Harper for redOrbit.com – Your Universe Online Some of the finest minds in Japan have finally unlocked one of the world’s greatest mysteries. Animal physiology researchers Tsuyoshi Shimmura and Takashi Yoshimura of Nagoya University in Japan have said they now understand what stirs a rooster to crow in the morning, and it’s not the sun. Farmers have relied on roosters as mother nature’s alarm clock for centuries, but it was never fully understood if these animals crowed...